Ammannia robusta Heer & Regel. Grand Redstem. Phen: Jan-Dec. Hab: Marshes, ditches, swamps. Dist: OH and BC south to w. KY, w. TN, LA, TX, CA, Mexico, and Belize; West Indies; introduced in NJ and n. South America.

Origin/Endemic status: Native

Synonymy: = Ar, C, FNA10, GrPl, Il, K1, K3, K4, Meso4.1, Mex, Mi, Tn, Graham (1985); < Ammannia coccinea Rottb. – Bah, F, GW2, S, Graham (1975)

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Wetland Indicator Status:

• Atlantic and Gulf Coastal Plain: OBL
• Eastern Mountains and Piedmont: OBL
• Great Plains: OBL
• Midwest: OBL
• Northcentral & Northeast: OBL

Heliophily: 9